Finding the Fourth Proportional to 109.61, 164.31 and 75.39

Step by Step Solution

1. Step 1: Write the proportion equation
   109.61 : 164.31 = 75.39 : x
2. Step 2: Convert to fraction form
   109.61/164.31 = 75.39/x
3. Step 3: Cross multiply
   109.61x = 164.31 × 75.39
4. Step 4: Simplify right side
   109.61x = 12,387.33
5. Step 5: Solve for x
   x = 12,387.33/109.61
6. Step 6: Final answer
   x = 113.01